Wait notify
Wait Notify A wait notify is a mechanism used to synchronize multiple threads when one thread needs to wait for a specific event or operation to complete. T...
Wait Notify A wait notify is a mechanism used to synchronize multiple threads when one thread needs to wait for a specific event or operation to complete. T...
Wait Notify
A wait notify is a mechanism used to synchronize multiple threads when one thread needs to wait for a specific event or operation to complete. This allows the other threads to continue executing without being blocked indefinitely.
How it works:
One thread, the notifying thread, sets a flag or executes an operation that indicates the event or operation will happen.
Another thread, the waiting thread, blocks its execution until it detects the flag or receives a notification.
Once the waiting thread detects the event, it releases the notifying thread and continues its execution.
Example:
Imagine two threads:
Thread A: This thread wants to wait for a new message to arrive in a chat window.
Thread B: This thread is responsible for sending the message.
Here's an example of wait notify:
java
public class Example {
private boolean notified = false;
public void threadA() {
// Set the flag to indicate that a message is received
notified = true;
// Perform some operations that depend on the message
System.out.println("Received a message!");
}
public void threadB() {
// Block execution until the notifying thread sets the flag
while (!notified) {
// Perform some waiting operations
}
// Process the message and complete the operation
System.out.println("Processing the message...");
}
}
Benefits of using wait notify:
Efficiently synchronize multiple threads
Prevent thread blocking and maintain responsiveness
Allow other threads to continue executing while waiting
Note:
The notifying thread needs to explicitly set the flag or notify the waiting thread through an external mechanism (e.g., a message queue, event listener).
The waiting thread should be designed to handle blocking operations gracefully and avoid becoming stuck